var btn1=document.getElementsByClassName("btn")[0];
var btn2=document.getElementsByClassName("btn")[1];
btn1.onclick=function(){
	var form1=document.getElementById("form1");
	var form2=document.getElementById("form2");
	form1.style.display="none"
	form2.style.display="block"
}
btn2.onclick=function(){
	var form1=document.getElementById("form1");
	var form2=document.getElementById("form2");
	form1.style.display="block"
	form2.style.display="none"
}